Developer Services Payment Issue

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Updated: 18:00 21 October 2020

We’ve now fixed the issue where customers were unable to pay for some of our applications online. However, customers who are paying for asset surveys/sewer traces or purchasing maps of public sewers may still have difficulty paying online.

We’re currently working hard to fix this issue. In the meantime, should you wish to make payment, please either utilise the BACS details on our quotation or send a cheque payable to Dŵr Cymru Welsh Water to Dŵr Cymru Welsh Water, PO Box 3146, Linea, Fortran Road, Cardiff, CF30 0EH.

We will continue to update this with any further news. Should you require any assistance, please do not hesitate to contact us on 0800 917 2652.

Our new developer portal

You can now apply for and track applications via our innovative new developer portal.

Find out more here

Diverting, altering or abandoning a public sewer


If you want to improve or develop land that you own, and the public sewerage would likely stop or hinder your development, then you have the right to request its alteration or removal. However, this does not apply to any sewers on a public highway or road.

Once we’ve received your expression of interest form, we will review your requirements and we will issue you with a follow up email with the application pack attached. Please complete the application form and return it to us by sending it to developer.services@dwrcymru.com along with all of the requested supporting documentation.

Once we’ve got all the information we need, our engineers will then consider your request and let you know whether we agree with your suggestion within 28 working days.

If you aren’t sure how to fill out either the expression of interest form, application form or have any questions, take a read of our guidance notes.

How much will it cost?

  • There's no upfront cost for applying for this service. As every case is different, one of our engineers will be able to calculate the cost of the work for your application once it's been vetted and approved. The fee is derived from the cost of the construction works to divert the sewer so it is important that a cost estimate is provided. 
  • View our Schedule of Charges for more information on how the fee for the sewer diversion is calculated
  • You’ll only need to pay once an engineer has approved the sewer diversion design

Important note

  • In line with the Water Industry Act 1991, we have a duty to consider all reasonable requests for diversion.
  • However, a diversion which would mean that the public sewer would be unusable, inaccessible or see its performance reduced would typically be considered unreasonable.